Apparatus and method for termination powered differential interface periphery

a technology of differential interface and apparatus, applied in the direction of power consumption reduction, baseband system details, instruments, etc., can solve the problems of current dissipation of power, consumption of power, and typical waste of power

Active Publication Date: 2008-11-13
ANALOGIX SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the drivers are differential they draw a constant DC current and consume power.
This part of the power is ty

Method used

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  • Apparatus and method for termination powered differential interface periphery
  • Apparatus and method for termination powered differential interface periphery
  • Apparatus and method for termination powered differential interface periphery

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Embodiment Construction

[0011]An apparatus and method for supplying power to the peripheral circuits of a transmitter circuit, especially a high-definition multimedia interface (HDMI) transmitter circuit, is disclosed. In an HDMI transmitter, the termination resistors of the output driver are part of the receiver. DC power for the driver is supplied through these termination resistors. In prior art implementations of circuits this power, supplied by the receiver circuit, is wasted in setting the DC conditions of the differential line driver. It is suggested to use this wasted power from the remote termination to power selected peripheral circuits of the transmitter. The use of this wasted power of the line driver for powering the peripheral circuits reduces the total system power.

[0012]FIG. 2 is a non-limiting and exemplary HDMI video system 200 using the disclosed invention. The output drivers have terminations 120 comprising resistors R0 and R1, at the receiver, connected to the receiver's power supply. ...

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Abstract

An apparatus and method for supplying power to the peripheral circuits of a transmitter circuit, especially an HDMI transmitter circuit, is disclosed. In an HDMI transmitter the termination resistors of the output driver are part of the receiver. DC power for the driver is supplied through these termination resistors. In prior art implementations of circuits this power, supplied by the receiver circuit, is wasted in the DC set-up circuit of the differential line driver. It is suggested to use this wasted power from the remote termination to power selected peripheral circuits of the transmitter. The use of this wasted power in the line driver for powering the peripheral circuits reduces the total system power.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention generally relates to the powering of peripheral devices through a remotely terminated differential driver load supply and more specifically to powering of peripheral circuits of an HDMI transmitter from the wasted power of the HDMI transmitter driver that is terminated at the receiver.[0003]2. Prior Art[0004]A typical high-definition multimedia interface (HDMI) transmission system 100 is shown in FIG. 1. The HDMI system has a transmitter driver side 110 with the drivers and the peripheral circuits, and a termination side at the receiver 120. The twin differential drivers NL0 and NL1 of the source transmitter 115, driving the signal lines TXN and TXP respectively, are terminated through the termination resistors R0 and R1 connected to power supply at the receiver, or sink side, 120. The termination is, for example, to the 3.3V nominal power supply per the HDMI specification. The transmitter drivers draw cur...

Claims

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Application Information

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IPC IPC(8): G05F1/10
CPCH03K19/0008H04L25/0264H04L25/0272H04L25/028
Inventor CHI, HONGWU
Owner ANALOGIX SEMICON
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